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About:
Japsum (short for "Japanese Sum") is a free, logic-based, combinatorial number-placement puzzle game. It’s similar to Kakuro or Sudoku puzzles, but with its own unique twist.
Starting with an empty grid, you’ll use hints provided on the sides and top to place numbers or black boxes in the grid. The hints indicate the sums of consecutive numbers, with no black boxes in between. Multiple hints mean that sequences of numbers are divided by one or more black boxes. By using logical reasoning and interpreting these hints, you’ll make steady progress in filling in the grid with numbers and black boxes.
Be prepared—especially with the larger grids, these puzzles can get very challenging! The app offers grid sizes ranging from 3x3 to 22x22—the largest puzzles of this kind, as far as I know. Every puzzle has exactly one unique solution, ensuring a fair and rewarding challenge.
As you solve puzzles, your level increases, unlocking larger grids and fun bear avatars that you can choose to represent your progress. Best of all, Japsum is completely free—so you can dive into the world of Japanese Sum puzzles at no cost.
Are you ready to test your logic and take on the ultimate puzzle challenge? Download Japsum today and start solving!
For any inquiries, feedback, or support, feel free to contact me at:
Check out my YouTube channel for gameplay examples and updates about Japsum:
Links:
Unfortunately, Google Developers was somehow unhappy with me or my app, and I couldn’t get it into the Google Play Store.
Introduction to Japsum and solving a 3x3 (english)
Introduction to Japsum and solving a 3x3 (english)
Solving a 4x4 Japsum Puzzle (english)
Solving a 4x4 Japsum Puzzle (english)
Solving a 6x6 Japsum Puzzle (english)
Solving a 6x6 Japsum Puzzle (english)
Vorstellung der Japsum App und lösen eines 3x3 Puzzles (deutsch)
Vorstellung der Japsum App und lösen eines 3x3 Puzzles (deutsch)
Lösen eines 4x4 Japsum Puzzles (deutsch)
Lösen eines 4x4 Japsum Puzzles (deutsch)
Lösen eines 6x6 Japsum Puzzles (deutsch)
Lösen eines 6x6 Japsum Puzzles (deutsch)
Taming the Monster: Solving a 22x22 Japanese Sum Puzzle – Replay
Taming the Monster: Solving a 22x22 Japanese Sum Puzzle – Replay
Here I solved a 22x22 puzzle, the biggest the Japsum App provides. It is quite though but definitely possible. A little explanation how to tackle it, in general you want to start with the most restricted lines, this is where there are fewer possibilities in general and on the corners. I mark a hint yellow when there is only one specific represantation of the hint. Lets say the hint is a 3, in general it could be 1+2 or 3. But if there is maybe another 1 or 2 in the same row/column, then that 1 or 2 can only be represented as a 1 or 2 and the 3 also must be the 3. So in some very restricted lines you can work your way up the numbers and maybe find that actually maybe a hint like 12 which has many possibilities, actually could be narrowed down to 5+7 or something like this. Solved hints I mark as blue (if I remember to do it).
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